Christopher Jon Michael Northam Jr., 25, was arrested on a Placer County Superior Court warrant, according to a news release from Roseville police.

He is charged in the death of his father, Christopher D. Northam. The suspect's ex-wife, Averill Elizabeth Easley, is accused of being an accessory after the fact, police said.

Detective Mark Toupin said Wednesday that investigators are sure the son's motive was financial gain. Toupin also said the victim's son planned the killing and was waiting for his father to enter the building on the day of the killing.

Roseville officers found Christopher D. Northam, 44, shot to death on the afternoon of May 30, 2011, police said. They were called to an argument and reports of shots fired at Skim X, located at 8292 Industrial Ave.

Skim X was an indoor sports business that never opened. The victim, from Rocklin, was the store owner.

Toupin said the business was in financial trouble, with Northam Sr. continually searching for more investors.